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Hello good,
There can be several reasons. but I would start by cleaning the body of the Butterfly, it may just be dirty or in the worst case the internal gear is worn, the servomotor turns but does not activate the wing nut, being closed to the passage of air.
Also clean the IAC valve, which is the one that controls idle speed. Attention measure the distance of the valve to assemble in the same position.



Greetings.
 

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Have a mechanic put a fuel pressure gauge on your fuel system to see if it's a low fuel pressure issue. Fuel delivery problems can often occur without a check engine light warning
 
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